Duke University researchers develop scaffold to fight ischemic stroke gaps

The primary obstacle in treating severe ischemic stroke is the formation of a fluid-filled cavity where brain tissue has died. Because neurons do not naturally regenerate, returning blood flow to these zones is insufficient; the void remains a physical barrier to recovery. Current medical approaches focus on plasticity—training surviving neural networks to bypass the damage—rather than filling the gap. Researchers from Duke University have shifted the objective from bypassing the void to transforming it into a zone of active regeneration. The core of their approach is a microporous annealed particle scaffold (MAPS). Unlike a solid gel, MAPS consists of tiny hydrogel particles that link together after injection to form an open-pore network. This architecture allows cells to migrate into the lesion site and move through the material without waiting for it to degrade. The scaffold acts as a structural foundation, but the biological driver is a set of extracellular vesicles (EVs) secreted by astrocytes. These nano-particles carry proteins and genetic material that function as instructions for other cells. By chemically anchoring these vesicles to the hydrogel particles, the team created a localized hub where any cell entering the pores is exposed to a constant stream of regenerative signals.